Elastic-fluid turbine.



F. SAMUELSON.

ELASTIC FLUID TURBINE.

APPLICATION FILED MAR. 29. 1911.

1 ,O4;2,147, Patented Oct. 22, 1912.

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UNITED STATES PATENT OFFICE.

FREDERICK SAMUELSON, OF RUGBY, ENGLAND, ASSIGNOR T0 GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

ELASTIC-FLUID TUBBIN E.

To all whom it may concern;

Be it known that I, FREDERICK SAMUEL- sox, a subject of the King ofSweden, residing at Rugby, in the county of Warwick, England, haveinvented certain new and useful Improvements in Elastic- Fluid Turbines,of which the following is a specification.

My invention relates to elastic fluid turbines and has particularreference to the means for securing the nozzles and the stationary orintermediate guide vanes or buckets within the casing of a turbine andin particular a turbine of the well known Curtis type.

In the Curtis turbine it has been customary to secure the intermediateguide vanes either directly to the casing or to a plate secured directlyto the casing and separate from the nozzles. This in either casenecessitates the machining of a considerable portion of the interior ofthe casing.

The object of the present invention is to reduce the amount of machiningnecessary and thereby to reduce the cost of manufacture.

To this end the invention resides in the feature of securing theintermediate guide vanes to a support which is common to them and thenozzles and is secured to the diaphragms between the stages. By thisconstruction only those portions of the interior of the casing withwhich the peripheries of the diaphragms engage require to be machined.The assembling of the turbine is also simplified, since the rotatingand, stationary blades and the nozzles and the wheels and diaphragmscarrying them may all be assembled in their relative positions on theshaft and then inserted into the casing as a single part.

The accompanying drawing, which is a sectional view of the first twostages of a turbine of the Curtis type, illustrates my invention.

In carrying out my invention according to the embodiment illustrated Iprovide a ring plate 1, preferably made in sections, in which the inletsupply nozzles 2 for the elastic fluid are formed. This plate is letinto or secured on the face of the diaphragm 3 at the end of the casing4 in any convenient or suitable manner. Projecting from the face of thisplate near its periphery and at right angles thereto is a cylindricalring 5,

Specification of Letters Patent.

Application filed March 29, 1911.

Patented Oct. 22, 1912. Serial No. 617,661.

the depth of which, measuring from the lower face to the face of theplate, slightly exceeds the distance from the face of the plate to thelower edge of the roots of the last row of intermediate vanes. The innerside of this cylindrical ring is grooved at 6 to receive the roots ofthe stationary vanes 7 which may be secured in place in any well knownmanner. The segments of the plate 1 and the segments of the ring 5 arepreferably cast in one piece. These are secured to the diaphragm 3 byaxially extending bolts 11. The plate and ring in the second stage aresupported by a lip or shoulder 8 on the diaphragm and also by the bolts11. The wheels 9 are carried by the shaft, not shown, in any well knownmanner. Each wheel is provided with two or more rows of buckets or vanes10 which are secured in any well known manner. The nozzles 2 may bediverging or non-diverging in character. The velocity of the steam dueto the nozzles is abstracted in successive fractions by the wheelbuckets, the intermediate or stationary buckets 7 serving to direct thesteam from one row of wheel buckets to the other.

My invention is particularly useful in turbines where the nozzles extendwholly or largely around the wheel but it is also useful where thenozzle arc is limited.

My invention has been illustrated in connection with a vertical shaftturbine but it is also applicable to horizontal shaft turbines.

It will be seen that the plate and ring are Lsl1aped in cross-section,and that the leg of the structure which supports the intermediates isseparated from the inner wall of the casing by a space. By reason ofthis latter feature the effects of distortion due to heat are minimized.

In accordance with the provisions of the patent statutes, I havedescribed the principle of operation of my invention, together with theapparatus which I now consider to represent the best embodiment thereof;but I desire to have it understood that the apparatus shown is onlyillustrative, and that the invention can be carried out by other means.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is

1. In an elastic fluid turbine, the combination of a casing, a diaphragmfor dividing the casing into stages, bucket wheels for the stages,intermediate buckets located between the wheel buckets, a nozzle fordischarging fluid against the wheel buck ts which nozzle is formedseparately from the diaphragm,

5 and a support located within the casing that is common to the nozzleand the intermediate buckets and is carried by the diaphragm.

2. An elastic fluid turbine comprising a casing, a diaphragm, and awheel and its bucket-s with a nozzle plate that is secured to thediaphragm within. the casing, said plate having nozzle passagescompletely formed therein and located intermediate its inner and outeredges, a ring that is secured to the plate, and intermediate buckets carried by the ring which are located between the wheel. buckets,

3. An elastic fluid turbine comprising a casing, a diaphragm, and awheel and its buckets with a nozzle plate, said plate having nozzlepassages completely formed therein, means for securing the nozzle plateto the diaphragm which includes a shoulder between it and the diaphragm,a ring attached to the plate, and intermediate buckets carried by thering and located between the wheel buckets.

4. An elastic fluid turbine comprising a casing, a diaphragm havingpassages there Copies of this patent may be obtained for five centseach, by addressing the Commissioner beyond the inner and outer walls ofthe diaphragm passages, a ring which is secured to the plate and isseparated from the inner wall of the casing by a space, and intermediatebuckets carried by the ring which are arranged in a row and are locatedbetween adjacent rows of wheel buckets.

5. An elastic fluid turbine comprising a casing, a diaphragm havingpassages leading to the nozzles and a circumferential groove adjacentthe outlet end of said passages, a wheel and its rows of buckets, anannular plate provided with nozzles and mounted on the diaphragm withits inner edge in engagement with said groove, intermediate bucketsarranged in a row between the wheel buckets, and means for supportingthe intermediate buckets from the plate.

6. As an article of manufacture a cylindrical structure which is l.shaped in crosssection, one leg of said structure being provided withnozzle passages located about midway the inner and outer edges thereofwhile the other leg is provided with a row of buckets, the plane of thebuckets and that of the nozzle passages being perpendicular to eachother.

In witness whereof, I have hereunto set my hand this eleventh day ofMarch, 1911.

FREDERICK SAMUELSON.

l Vitnesses CHARLES H. FULLER, J. A. FOSTER.

of Patents.

Washington, D. C.

